Without either of the two quarterbacks available this spring, Stanford’s reps will belong to Jack Richardson. Davis Mills, who redshirted in 2017, is recovering from a knee injury and also won’t be available.

Costello, a junior in 2018, was 124-211 passing for 1,573 yards, 14 touchdowns and four interceptions in 2017. He was the team’s leading passer in completions, completion percentage, yards and touchdowns.